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Did anyone ever attempt to build a functioning perpetual-motion machine?

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There were a number of early attempts to design and construct various types of perpetual-motion machines; however, since the 19th cent., when the laws of thermodynamics became understood, most such attempts have been abandoned.

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Similar questions: Why have no perpetual-motion machines been built since the 19th century? When were the laws of thermodynamics first discovered? [ Hide these questions ]

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